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        <h1 id="负载均衡的5种策略"><a href="#负载均衡的5种策略" class="headerlink" title="负载均衡的5种策略"></a>负载均衡的5种策略</h1><p>要理解负载均衡，必须先搞清楚正向代理和反向代理。</p>
<p><strong>负载均衡的几种常用方式</strong></p>
<h2 id="1、轮询（默认）"><a href="#1、轮询（默认）" class="headerlink" title="1、轮询（默认）"></a>1、轮询（默认）</h2><p>每个请求按时间顺序逐一分配到不同的后端服务器，如果后端服务器down掉，能自动剔除。</p>
<figure class="highlight nginx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="section">upstream</span> backserver &#123;</span><br><span class="line">    <span class="attribute">server</span> <span class="number">192.168.0.14</span>;</span><br><span class="line">    <span class="attribute">server</span> <span class="number">192.168.0.15</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="2、weight"><a href="#2、weight" class="headerlink" title="2、weight"></a>2、weight</h2><p>指定轮询几率，weight和访问比率成正比，用于后端服务器性能不均的<br>情况。</p>
<figure class="highlight routeros"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">upstream backserver &#123;</span><br><span class="line">   <span class="built_in"> server </span>192.168.0.14 <span class="attribute">weight</span>=3;</span><br><span class="line">   <span class="built_in"> server </span>192.168.0.15 <span class="attribute">weight</span>=7;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>权重越高，在被访问的概率越大，如上例，分别是30%，70%。</p>
<h2 id="3、ip-hash"><a href="#3、ip-hash" class="headerlink" title="3、ip_hash"></a>3、ip_hash</h2><p>上述方式存在一个问题就是说，在负载均衡系统中，假如用户在某台服务器上登录了，那么该用户第二次请求的时候，因为我们是负载均衡系统，每次请求都会重新定位到服务器集群中的某一个，那么<strong>已经登录某一个服务器的用户再重新定位到另一个服务器，其登录信息将会丢失，这样显然是不妥的</strong>。<br>我们可以采用<strong>ip_hash</strong>指令解决这个问题，如果客户已经访问了某个服务器，当用户再次访问时，会将该请求通过<strong>哈希算法，自动定位到该服务器</strong>。<br>每个请求按访问ip的hash结果分配，这样每个访客固定访问一个后端服务器，可以解决<strong>session的问题</strong>。</p>
<figure class="highlight roboconf"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">upstream backserver &#123;</span><br><span class="line">    <span class="attribute">ip_hash;</span></span><br><span class="line"><span class="attribute">    server 192.168.0.14</span>:88;</span><br><span class="line">    <span class="attribute">server 192.168.0.15</span>:80;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="4、fair（第三方）"><a href="#4、fair（第三方）" class="headerlink" title="4、fair（第三方）"></a>4、fair（第三方）</h2><p>按后端服务器的响应时间来分配请求，响应时间短的优先分配。</p>
<figure class="highlight abnf"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">upstream backserver &#123;</span><br><span class="line">    server server1<span class="comment">;</span></span><br><span class="line">    server server2<span class="comment">;</span></span><br><span class="line">    fair<span class="comment">;</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="5、url-hash（第三方）"><a href="#5、url-hash（第三方）" class="headerlink" title="5、url_hash（第三方）"></a>5、url_hash（第三方）</h2><p>按访问url的hash结果来分配请求，使每个url定向到同一个（对应的）后端服务器，后端服务器为缓存时比较有效。</p>
<figure class="highlight nginx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="section">upstream</span> backserver &#123;</span><br><span class="line">    <span class="attribute">server</span> squid1:<span class="number">3128</span>;</span><br><span class="line">    <span class="attribute">server</span> squid2:<span class="number">3128</span>;</span><br><span class="line">    <span class="attribute">hash</span> <span class="variable">$request_uri</span>;</span><br><span class="line">    <span class="attribute">hash_method</span> crc32;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<h1 id="配置实践"><a href="#配置实践" class="headerlink" title="配置实践"></a>配置实践</h1><p>在需要使用负载均衡的server中增加</p>
<figure class="highlight scss"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">proxy_pass http://backserver/; </span><br><span class="line">upstream backserver&#123; </span><br><span class="line">    ip_hash; </span><br><span class="line">    server <span class="number">127.0</span><span class="selector-class">.0</span><span class="selector-class">.1</span>:<span class="number">9090</span> down; (down 表示单前的server暂时不参与负载) </span><br><span class="line">    server <span class="number">127.0</span><span class="selector-class">.0</span><span class="selector-class">.1</span>:<span class="number">8080</span> weight=<span class="number">2</span>; (weight 默认为<span class="number">1</span>; weight越大，负载的权重就越大) </span><br><span class="line">    server <span class="number">127.0</span><span class="selector-class">.0</span><span class="selector-class">.1</span>:<span class="number">6060</span>; </span><br><span class="line">    server <span class="number">127.0</span><span class="selector-class">.0</span><span class="selector-class">.1</span>:<span class="number">7070</span> backup; (其它所有的非backup机器down或者忙的时候，请求backup机器) </span><br><span class="line">&#125; </span><br></pre></td></tr></table></figure>

<p>max_fails：允许请求失败的次数默认为1.当超过最大次数时，返回proxy_next_upstream 模块定义的错误;</p>
<p>fail_timeout: max_fails次失败后，暂停的时间;</p>
<p>配置实例：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_">#</span><span class="language-bash">user  nobody;</span></span><br><span class="line"></span><br><span class="line">worker_processes  4;</span><br><span class="line">events &#123;</span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">最大并发数</span></span><br><span class="line">worker_connections  1024;</span><br><span class="line">&#125;</span><br><span class="line">http&#123;</span><br><span class="line">    # 待选服务器列表</span><br><span class="line">    upstream myproject&#123;</span><br><span class="line">        # ip_hash指令，将同一用户引入同一服务器。</span><br><span class="line">        ip_hash;</span><br><span class="line">        server 125.219.42.4 fail_timeout=60s;</span><br><span class="line">        server 172.31.2.183;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    server&#123;</span><br><span class="line">        # 监听端口</span><br><span class="line">        listen 80;</span><br><span class="line">        # 根目录下</span><br><span class="line">        location / &#123;</span><br><span class="line">        # 选择哪个服务器列表</span><br><span class="line">            proxy_pass http://myproject;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<blockquote>
<p>参考链接<br><a target="_blank" rel="noopener" href="https://segmentfault.com/a/1190000014483200">nginx负载均衡的5种策略</a></p>
</blockquote>

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